She appears to have been tweeting during the duration of filming! (Unless someone was doing it for her, of course). She also has a background in production. Possible she did some production work for the Race. She could still be a possibility, we'll see!

I suspect the latter half (focusing on the last week) of January, once CBS has released the Survivor cast for their new season. (On the average the cast announcements are about three weeks before the premiere.)